Upright drill



2 sheets-sheet 1'.

G. M. COBURN.

(Model.)

UPRIGHT DRILL.

245,134.- Patented Aug. 2,1881. y

GEORGE M. ooBUEN, or' WALTHAM, MASSACHUSETTS.

UPRIGHzT-DRILL.

sPEcIrxcA'rroM. forming part of Lettersglsatent No. 245,134, datedAugust 2, 1881.: y nppncauon'nied oqftobrn, 1ero. (Model.)

Iolall 'ui/wm it may concern: Be it known that I, GEORGE M. CoBUaN, a?

resident of Waltham, in the county of Middle-f*l sex and State ofMassachusetts, have invented certain new and useful 'Improvements inUp-if` right Drills; and 1 do hereby decisi-echar the; following is afull, clear, and exact description thereof, reference being had to the'accompanyy cation.

ing drawings, andto the letters of reference) marked thereon, making apart of this specifi-i This invention relates to hand-drilling inachinesadapted to' produce automatically a fast,y or slowlmotion of the drillat the'pleasure of; the operator. g

It has for its object an improvement in the;` means, first, forproducing a slow automatic feed of the drill and for its adjustment;sec. ond, for throwing the ldrill out of gear auto-5y matically,.and forproducing its quick returm` when it has completed its downward movel.-

ment; third, for changing the Speed and power? ofthe drill; fourth, for'lifting the drill-table out of way of the foot-piece by 'a hin-ged joint5:

and, fifth, for adjusting the foot-piece and ta- .a top view of .theapparatus.V

frontelevation, showing the drill-table thrown? up'lupon its hinge; Fig.2, a cent-ra ransverse] -section taken laterally through the d ill inline` .r w, Fig. 4; Fig. 3, a 'sideelevatiom with the@ side gearingremoved'to illustrate t e. parts otherwise hidden thereby,- and Sho )ingthe; drill-table in Working position 5 and Fig. 4 is A, Figs. 3 andl 4,represents .the mainup-li right frame of the machine; B, the spindle ofthedrill, supportedv bythe frame in verticall .bearings a a A', Figs. 1and 2, a horizontallz 40- side frame projecting from and connected with?the main VframaA and supporting the bear- 4ings'for'thehorizontal shaftsC EF. The

driving-shaft C is geared by means ofthe intermediate bevel-Wheelsdirectly to the spindle B, and maybe driven directly from the actu`ating-crank D of the machine, or indirectly and with a-higher speed by`means of a secondaryy set of gear-wheels and an auxiliary speed-shaft,

TE. A ily-Wheel shaft, F, is geared to the shaft; 1F', and also tocrank-headDQso as tofhave 'constant..motionlA The crank D is secured to,shaft of the iiy-wheel F.v to increase the speed of the main shaft Gthe ,crank-head D is loosened, so as'to turn freely with its gear-wheell upon theend of the shaft. 3 i 'The movement of thecrank is thencommuni- Ycated by mea-ns'of the gear-wheel l to the second shaft,'Eandfrom it, by means of the gear- -Wheel2, to the pinion 3 upon the shaftC, the

difference in diameters'of the gear-wheels servahead or sleeve, D',carrying upon its inner end a gear-wheel, 1. v This head or sleeve isleft free to revolve loosely upon the vend of the driving-shaft C, butmay be rigidly fixed to it byfmeans of a set-screw, e. (See Figs. 2 and4.) The gear-wheel maintains the same position upon the crank-head DtWhether thelatter is `fixed or loose, and it meshes with a smallerpinion upon the end 0f the second horizontal shaft, E. (See`Fig.4.)Alarger'gear-WheeLZ, y.

is'secured by a feather on Vthis shaft E, so as .to revolvewith it andyet be free to move Alongitudinally in and outfot' gear with a smallergear-wheel, 3, upon the front shaft, C, (See Figs. 11 and 2,) and itmeshes also constantly .with a small extended pinion, 4, (see Fig. 4,)upon the When it is desired ing to multiply greatly the speed. Where aslow speed is requiredthecrank-head D is "rmly secured-to the shaft C bymeans'of the 'set-screw e, and the pinion 2 upon the speedshaft E isthrown out of gear withY the pinionA 3, so thatthe movement of the crank,is imparted directly to the main shaft G. Ineither 'case the movementof the'crank through the intervention of .the gear-Wheelsfl, 2,)l and 4is i constantly communicated tothe ily-wheel shaft .F without change, sothat thel ily-wheel will always revolve in 'the same direct-ion and withuniform speed, whether the speed-shaft E be fin or out of gear with theShaft C, and-conse- 'que'ntly revolving with slow or vwith rapidmotion.4 The revolution of the shaft C produces, by means of beveledgears G G', Figs. 1 and 2, aconstantrevolution of the drill-spindle B.

.` Upon the upper end ofthe spindle is placed a horizontalratchet-wheel, H, (see Fig.'4,) which turns loosely upon the spindle.

Upon a frame or plate, K, supported over the wheel H by means ot' acurved bracket,L, Secured to the upper part ofthe frame A, are pivctedtivo levers, M M, whose outer arms'ex- IOO f tend: to "theouter edge ofthe ratchet-wheel and carry swinging pawls m m to engage theratchet-teeth of the wheel, and whose inner arms are fitted withfriction-rollers n a to bear against a cam, o, secured to the spindle B.The inner ends of the levers m m are thrown inward so as to bring thefriction-rollers into constant bearing against the cam by means ofsuitable springs p 1J, Fig. 4. The levers are so adjusted with referenceto the cam that the revolution of the spindle will alternately throw theinner ends of the ratchet-levers outward and their outei arms forward,and thereby produce, by means of the engagement of the pawls m m withthe ratchet-wheel teeth, a corresponding movement of the ratchet-wheel.The forward movementof each lever under the iniiuence of the cam willcompress the leverspring, which will then operate to throw back thelever when the pressure of the cam is removed. The alternate movement ofthe two levers will produce a nearly constant movement of theratchet-wheel. The extent of the forward movement or throw of eachlever, and consequently the degree of movement of the ratchet-wheel ateach revolution of the drill spindle and cam, is regulated by means ofthe bar P pivotcd upon the spindle and supported upon a pillar, P', Fig.3, projecting from the bracket L. The position of this bar P is adjustedby means of a set-screw, o, passing through a slot in the bar. A pin orstop, d, depends froln this bar in front of the outer end of each armand serves to arrest the backward movement of the arm under theinfluence ot' its spring. By turning the bar P so as to bring lthe stopsnearer to or farther from the levers and securing it when adjusted bymeans of the set-screw c the throw of each lever is controlled so as toproduce a slower or more rapid movement of the ratchet-wheel.

.The spindle B is fitted below the feed-wheel H with aneXteriorly-threaded sleeve, J', which is so made to engage the spindleas to prevent any independent longitudinal movement of the sleeve andspindle, and yet allow the spindle to revolve freely within the sleeve.The feed of the spindle B is produced by means of this threaded sleeve Jand an interiorly-threaded nut, J, (see Fig. 2,) fitted thereon. Thisfeednut J is free to revolve inbearin gs in the frame A and carries atits upper end a loose clutch, R, Figs. 1 and 2, which when thrown upengages co-actin g projections on the under side of the horizontalratchet-wheel H. When the clutch R is slipped up to engage the ratchetfeed-wheel H the movement of theratchet-wheel is transmitted to the nut,and the latter byits rotation causes downward vertical movement inthedrill-spindle B. The feed-nutJ is coupled by bevel-gears 5 and 6 withthe shaft of a handwheel, S, revolving horizontally in a bracket, S',extended for the purpose from the main frame A. A cog-wheel, 7, formedupon a collar sliding longitudinally upon thespindleB above the lowerdrive bevel-wheel G, and made to rotate with the spindle by means of aspline between the two, engages the bevel-wheel 6 when properly carriedupagainst it. (See Fig. 2.)

The lower end of the collar of the wheel 7 is provided with a clutch, toen gage the face of the lower drive-wheel, G ,when dropped against it. Aforked clutch-bar, lt, Figs. 1 and 2, engages the collar of the wheel 7,and is connected with the upper clutch-bar, R', by a coupling-bar, T,sliding in suitable ways, or upon pins projecting from the fixedbearings a a of the spindle, so that when the upper clutch, R, engagesthe ratchet-wheel H the lower clutch shall be disengaged from the lowerdrive-wheel, G, and vice versa. A pin mounted upon the threaded sleeve Jprojects through a longitudinal slot in said reversing slide-bar T, andan adjustable stop is iitted in the slot, against which the pin isbrought to bear in the upward movement of the drillspindle B when it hasnearly reached its highest desired elevation, so that spindle B willcarry up with it the reversing-bar T. This movement of the bar willoperate to engage the upper and disen gage the lower clutch, and thusreverse the feed of the spindle. In its downward movement the pin fromthe sleeve J will bear against a lower stop in the slot of the bar T, sothat when the drill has nearly reached its lowest point the reversingbar T will be forced down, the upper clutch disengaged, and the lowerclutch made to engage the bevel drive-wheel G, so as to reverse the feedautomatically and produce afast upward movement of the drill.

When the drill is being fed by the ratchetwheel H it may be fedindependently as fast as desired by means of the hand-wheel S. The feedof the drill may be placed wholly under control of the hand-wheel S bythrowing up the pawls m from the ratchet-wheel and sliding up thereversing slide-bar T to disen-l gage the lower clutch from thedrive-wheel. When this clutch is not released from its connection withthe driving-wheel the feed will be automatically reversed, producingalternately, with a constant movement of the crank and rotation of thedrill in one direction, a slow downward and a rapid upward feed ot' thedrill-spindle.

The foot-piece U of the drill is fitted to a vertical post, W, of themain frame by means of a collar encircling said post. A series ofcircumferential grooves, t t, are cut upon the post at regularintervals, and a catch, Fig. 3, upon the under side of the foot-piece isarranged to engage said grooves, and thus support the foot-piece at theheight of either of said grooves, and yet permit it to turn upon thepost without slipping.

A suitable table, Y, is hinged to a collar, Z, fitted upon the postabove the foot-piece so as to be supported by said foot-piece. The tablemay be turned up upon its hinge against the post out of the way of thefoot-piece, so that the latter may be used alone, or the table may belet down upon the foot-piece, in which case it receives lateral supporttherefrom by means IOO IOS

spindle, byvthrowing the speed-shaft in or out of gear with the mainshaft. A change of speedin the drill-spindle B, without changing thespeed of the driving-crank, is readily effected by loosening ortightening the attachment of the hub D of the crank to the maindrivingshaft C, and throwing the auxiliary speedshaft E in or out ofgear with said main shaft G.

The feed of the drill may be produced with a uniform gradual movement bysliding up the reversing-bar T so as to leave the gear-wheel 7disengaged from the drive-wheel Gr, and thus cause v"the feed-nut J tobe operated by the ratchet-wheel H, actuated by the cam and levers onthe upper end of the spindle B, this Aratchet-feed being rendered slowor fast by changing the position of the bar P, which controls the throwvof the levers. A rapid return of the drill-spindle B will be producedautomatically by the movement of the reversingbar T, through itsconnection with the threaded sleeve J on the drill-spindle, which willoperate so soon as the drill-spindle has reached its 'lowest point todisconnect the feed-nut J from the ratchet-wheel H and connect it bymeans of thegearingf, 6, and 7 with the main shaft, so as to produce arapid reverse movement of the feed-nut J This reverse movement will, inturn, be'automatically checked by the automatic movement of thereversing-slide T, actuatedby the upward movement of the threaded sleeveJ', which will operate to disconnect the gear 7 from the driving-wheelGr, and to connect nut J again with the feed-wheel E.

What I claim as new, and desire to secure by Letters Patent, is

1. The combination, with the driving-shaft G, of the drill and with anauxiliary shaft, E,

provided with a sliding pinion, by means of 5o which it may be thrown inand out of gear with said driving-shaft C, of a crank-hub, D',

and attached pinion 1, fitted to turn loosely upon thenend of thedriving-shaft C, and to gear with a pinion upon the auxiliary shaft E,and be secured at will to said drivin g-shaft G by means of-a set-screw,substantially in the manner and for the purpose herein set forth.

2. The combination of the crank-hub D and pinion 1, the auxiliary shaftE, and ily-wheel shaft F, geared to move together, with thedriving-shaft C arranged to be connected to and driven by either thecrank-hub D or Jthe auxiliary shaft E, as may be desired, substantiallyin the manner and for the purpose hereinset forth.

3. The combination of the upper clutch, R',

the feed-nut J, the ratchet-wheel H, sliding bar T, threaded sleeve J',reversing-pin, and lower clutch, B, substantially as and for the purposeherein set forth.

4. The combination of the bevel-gearing 5, 6, and 7, the feed-nut J, thedriving-shaft G, and bevel-gear G G', substantially as and for thepurpose herein set forth. p

5. The combination, with the main post W of an upright drilling-machine,and with a collar, Z, traversing and rotating upon said post, of a plateor table, Y, hinged to said collar to admit of being thrown upvertically against the post, substantially as and for the purpose hereinset forth;

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

GEO. M. COBURN.

Witnesses:

M. J. LARKIN, C. F. STONE.

